![]() ![]() In reality it is globs of oil that is rushing past the sight glass. They said to ignore the sight glass, as you can be seriously overcharged and still have what appears to be bubbles. They said that synthetic ester oil in R134a, never blends with the refrigerant, it moves through the system as globs of clear oil, looking exactly like bubbles, so you will never have a clear sight glass with that oil and refrigerant combo. ![]() The sight glass in a converted system ? What I got from a couple of AC retrofit sites that were heavily into so many conversions, said this. Some of these azeotropic witches brews or drop in replacements have to much glide to not pull it all out and recharge Edited by dave7745 16:37 Posted 16:31 (#3212031 - in reply to #3211795) Subject: Re: R/D sight glass for R134Aĭepends on vapor pressure and or saturation temp.With A/C there is no liquid receiver as in refrigeration so one will see bubbles or clear at times.Always charge to specs with a scale.R 134a is zeotropic so gas can be added or topped off. I was told today that that is wrong and with R134A you will always have bubbles. Is the sight glass serve any purpose other than seeing if Freon is flowing through the R/D? I was taught or at least thought I was that if you didn't know the systems capacity that you filled until the bubbles were gone in the sight glass. R/D sight glass for R134A Jump to page : 1 Now viewing page 1 ![]()
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